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The phytochemical study of  Stereocaulon montagneanum  harvested in Sumatra (Indonesia) led to the isolation of 11 known compounds including two metabolites not previously described in the genus  Stereocaulon , peristictic acid ( 8 ) and menegazziaic acid ( 10 ). The complete  1 H and  13 C NMR spectral assignments of stictic acid derivatives are reported with some revisions. Five depsidones belonging to the stictic acid chemosyndrome were superoxide anion scavengers as potent as ascorbic acid and with no toxicity on two human cell lines.

zeitschrift für naturforschung c

NMR reassignment of stictic acid isolated from a Sumatran lichen  Stereocaulon montagneanum  (Stereocaulaceae) with superoxide anion scavenging activities